[TenTec] Omni six-- heat related IF gain problem

[Duane A Calvin]

Interesting.  I ran my VI+  on a number of occasions in RTTY contests and
never needed a fan on the rig.  In fact, I had a Centurion amp sitting to
the LEFT of the radio, which means the hot exhaust blew onto the side of
the Omni, and it still continued to work FB for seven years.  The cabinet
would get plenty warm from the amp blowing on it, but I never lost
sensitivity or had drift problems.  Mine was a crystal oven model, not
TCXO.  Right now I'm wishing I hadn't sold it when I moved to the Orion. 
So, it's not all Omni's that appear to have this problem.
        
        73,  Duane


On Wed, 13 Jul 2005 14:11:26 -1000 Ken Brown <ken.d.brown at verizon.net>
writes:
> 
> >>This is the first I've heard of anyone installing cooling fans in 
> the Omni 6. 
> >>    
> >>
> >
> >
> >Actually, this wasn't an uncommon topic a few years back.  
> Personally,
> >I found that my PBT settings were shifted dramatically during cw
> >contesting due to internal heat buildup.  I used an external fan
> >blowing on the rear heatsink which seemed to help, but the 
> internal
> >cooling fan always seemed a good solution to me.
> >  
> >
> I find that operating my Omni VI in CW contests a fan on the PA heat 
> 
> sink is necessary. My Kenwood TS-440 has a built-in fan with 
> temperature 
> controlled speed, or at least duty cycle. The TS-440 receiver 
> performance in contest conditions does not compare to the Omni VI 
> though. I wish Ten-Tec would have included a built in fan. I have 
> never 
> tried, or thought that I needed, a fan to ventilate the insides of 
> the 
> Omni VI though.
> 
> Okay now you can flame me for saying that a JA rig has a usefull 
> feature 
> that is not in a Ten-Tec.
> 
> DE N6KB
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> 


--------------------------------------
Duane Calvin, AC5AA
Austin, Texas

http://home.austin.rr.com/ac5aa